Shaped charge well perforator
Patent 4387773 Issued on June 14, 1983. Estimated Expiration Date: 
October 13, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 13, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2782715 2892407 2984307 2988994 3129665 3154014 3358780 Powdered metal casing for perforating charge and its method of manufacture Patent #: 4220687 InventorAssigneeApplicationNo. 06/311105 filed on 10/13/1981US Classes:175/4.6, Concave-shaped charge102/306, Shaped charge or charge with detonation wave cavity modifier102/476Shaped chargeExaminersPrimary: Novosad, Stephen J.Assistant: Bui, Thuy M. Attorney, Agent or FirmInternational ClassesE21B 43/11 (20060101)E21B 43/117 (20060101) F42B 3/08 (20060101) F42B 3/00 (20060101) AbstractA shaped charge unit for well perforating having a outer shell with an internal cavity formed therein. An explosive charge material conforms in exterior shape with the inside surface of the cavity and is retained in place by a conical liner of non-explosive material. The interior shape of the cavity is such that an increased amount of explosive material is provided in a circumferential channel located proximate to the periphery of the base of the conical liner. | |
